Call by value and call by reference in C-Important topics in C-computer science/Information technology

Call by value and Call by Reference in C

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There are two ways to call out a function in C and those are Call by Value and Call by Reference. So, what they are, let's find out.

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Call by value: 

                               Here the values in the function get copies of the original values but they don't get a revert to the modified value. 

For example:

                     void swap(int x, int y)

                     {

                            int temp=x;

                            x=y;

                            y=temp;

                     }

                     int main()

                    {

                     int a=5,b=7;

                     swap(a,b);

                     printf("%d %d\n",a,b);// Would print 5 7 although the values got modified in the function.

                    }

This was Call by value.

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Call by Reference:

                           Here the values which get modified in the function would get reflected back in the main function by using the address and the pointers concepts in C programming language.

Taking the same example above:

                   void swap(int *x,int *y) // Using pointers. 

                   {

                           int temp=*x;

                           *x=*y;

                           *y=temp;

                   }

                   int main()

                   {

                          int a=5,b=7;

                          swap(&a,&b); // Using Addresses.

                          printf("%d %d\n",a,b);// Would print 7 5 as the values got modified in the swap function. 

                   }

This was Call by Reference.

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